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Re: USB Host mode from boot

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I found ID=L and VBUS=H condition at boot causes problem.

Once problem occurs, VBUS toggling not solve problem.

But ID toggling solves problem.

I don't know why.

 

You need ID toggling (by some GPIO) mechanism or VBUS switching (by PSW pin) mechanism.

 

Breakout board has VBUS switching mechanism(by U36 MIC2039).

But some external USB device with OTG cable that provide VBUS=H (or VBUS leakage) causes problem.

 

Finally I selected faking Edison's VBUS pin on my system.

I disconnect Edison's VBUS(20) from USB's VBUS,

and connect PSW(21) directly.


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